 public static String getReqInputStream(HttpServletRequest request) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream(), "UTF-8"));
        StringBuilder bs = new StringBuilder();
        while (true) {
            String readed = br.readLine();
            if (readed != null)
                bs.append(readed);
            else
                break;
        }
        br.close();
        return bs.toString();
    }
